1985078 has 4 divisors (see below), whose sum is σ = 2977620. Its totient is φ = 992538.

The previous prime is 1985077. The next prime is 1985167. The reversal of 1985078 is 8705891.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496268 + ... + 496271.

It is an arithmetic number, because the mean of its divisors is an integer number (744405).

2^1985078 is an apocalyptic number.

1985078 is a deficient number, since it is larger than the sum of its proper divisors (992542).

1985078 is an equidigital number, since it uses as much as digits as its factorization.

1985078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992541.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1985078 is about 1408.9279612528. The cubic root of 1985078 is about 125.6779800956.

The spelling of 1985078 in words is "one million, nine hundred eighty-five thousand, seventy-eight".